# 12. Output devices¶

## Ohood Walid¶

our group assignment is to measure the power consumption of our board after connecting with all the outputs. I used WANPTEK machine which is a adjustable DC voltage regulated power supply to measure my ATMEGA328P board connected with the screen, buzzer, and led.

then using this equation (P=IV):

Power = Voltage X Current

Power = 5 X 0.1

Power = 0.5 watts

I connected the output device (DC Buzzer) to the PCB I designed and I used DC Power Supply to provide 5V to the PCB to check the current in the closed circuit. As shown in the following video, the current is 0.1A

Then we used Digital Multimetere to measure the current and compare the two values shown on the power supply and the multimeter. As shown in the following video, the measured current equals to 0.0918A approximately and on the power supply equals to 0.09A.

For the Group Assignment, I’ll measure the power consumption for the motor. which will be used for my final project.

I have installed Two motors in my Robot and check the current consumption.

• First test in desk without load.

Power = Current x Voltage = 0.07A x 24.4V =1.708W

Power for each motor = 1.708 / 2 = 0.854W

• Second test with load and robot moving in the floor.
``````Power = Current x Voltage = 0.27A x 24.4V =6.588W

Power for each motor = 6.588 / 2 = 3.294W
``````